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[40.03] Free-Free Turnover in Nova V4743 Sgr 2002 #3

J.E. Lyke, M.S. Kelley, R.D. Gehrz, C.E. Woodward (University of Minnesota)

We present 1-20 micron spectral energy distributions (SEDs) of the recent bright nova V4743 Sgr (Nova Sgr 2002 #3) obtained 22-26 September 2002 at the 1.52-m Mt. Lemmon Observing Facility with the U of MN Bolometer. On 22 September UT, we observed a turnover in the SED at the narrowband 7.91 micron filter. In \lambda*F_\lambda vs. lambda space, the SED is consistent with that of free-free emission (index = -1) shortward of 7.91 micron and with optically thick emission (index = -3) longward of 7.91 micron in the Rayleigh-Jeans limit. Subsequent observations show a more flat SED indicating optically thin emission throughout our spectral coverage and implying the transition point has moved further into the infrared as the ejecta expanded.

We acknowledge support from NASA and the U.S. Air Force.

The author(s) of this abstract have provided an email address for comments about the abstract: lyke@astro.umn.edu

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.